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294 Tribology in machine design

average coefficient of friction during the recess period, then, for the constant
friction coefficient

and for different average friction coefficients during the approach and
recess periods

References tO Chapter 8 1. H. M. Martin. Lubrication of gear teeth. Engineering, 102, (1916), 16-19.
2. D. W. Dudley. Practical Gear Design. New York: McGraw-Hill, 1954.
3. K. F. Martin. The efficiency of involute spur gears. ASME Technical Paper, No.
80-C2/DET-16, 1980.
4. D. W. Dudley. Gear Handbook. New York: McGraw-Hill, 1962.
5. D. Dowson and G. R. Higginson. A Theory of Involute Gear Lubrication. Gear
Lubrication Symposium. London: Inst. of Petroleum, 1964.
6. D. W. Dudley. Information sheet Gear scoring design guide for aerospace spur
and helical power gears. Washington, D.C.: AGMA, 1965.
7. H. Blok. The postulate about the constancy of scoring temperature. Inter-
disciplinary Approach to the Lubrication of Concentrated Contacts, NASA SP-
237, 1970.